renamed games folder to entries folder (also contained frameworks, libraries, ...) and added to the backlog

entries/slade.md

@@ -0,0 +1,16 @@
+# SLADE
+
+_Tool of Doom._
+
+- Home: http://slade.mancubus.net/
+- State: mature
+- Download: http://slade.mancubus.net/index.php?page=downloads
+- Platform: Windows, macOS
+- Keywords: tool, inspired by Doom, swappable content
+- Code repository: https://github.com/sirjuddington/SLADE.git
+- Code language: C++
+- Code license: GPL-2.0
+
+Editor for Doom-engine based games and source ports.
+
+## Building